Three-dimensional appearance characterization of diffuse standard reflection materials
Three-dimensional appearance characterization of diffuse standard reflection materials
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漫标准反射材料的三维外观表征
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Kai
中科院分区：
文献类型：
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作者：
A. Höpe;Kai
描述漫反射材料的基础是辐射率因子β的概念，或者作为一种非常类似的描述，双向反射分布函数fr。这两种描述都使用了完全反射漫射器（PRD）的概念，根据定义，它反射入射辐射无损失，完全漫射，并具有朗伯方向特性。珠三角只是一个理论上的概念，并不可能在物质上实现。由于不存在具有这些特性的材料，因此在绝对测量的情况下，通过物理方法（即，通过测量设备本身）来实现。出于实用目的，辐射因子测量主要相对于商业上可获得的反射标准来完成。在本调查中，不同的广泛使用的漫反射材料进行了测量，第一次在一个多几何配置与机器人为基础的角度反射仪的Physikalisch-Technische Bundesanstalt（PTB），以表征其三维反射行为。对于一组四个不同的入射角，在550 nm的波长下确定全半球反射率。角分辨反射数据是辐射和光度测量产品的制造商、供应商和用户的重要参考。本文试图为研究和工业用户提供标准反射材料的强烈非朗伯反射行为的概述，因为普遍存在的错误假设是，常用的标准反射材料与PRD的理想规格只有微小的偏差。
The basis for the description of diffuse reflecting materials is the concept of the radiance factor β, or as a quite similar depiction, the bidirectional reflectance distribution function fr. Both characterizations use the concept of the perfectly reflecting diffuser (PRD), which reflects, by definition, the incoming radiation loss-free, completely diffuse and with Lambertian direction characteristics. The PRD is a theoretical concept only, which cannot be realized materially. Since there is no material with these characteristics, the realization is carried out with physical methods, i.e. by the measuring apparatus itself, in the context of an absolute measurement. For practical purposes, radiance factor measurements are predominantly accomplished relative to commercially available reflection standards. In the present investigation, different widely used diffuse reflection materials were measured for the first time in a multi-geometry configuration with the robot-based gonioreflectometer of the Physikalisch-Technische Bundesanstalt (PTB) in order to characterize their three-dimensional reflection behaviour. For a set of four distinct incident angles, the full hemispherical reflection indicatrix was determined at a wavelength of 550 nm. The angle-resolved reflection data are an important reference for manufacturers, providers and users of radiometric and photometric products. This paper attempts to give users in research and industry an overview of the strongly non-Lambertian reflection behaviour of standard reflection materials, because it is a widespread false assumption that commonly used standard reflection materials have only minor deviations from the ideal specification of the PRD.